Answer Happy

please answer both questions!! thank you!!
Question 3 If sin(A) = - where O<A I and tan(B) = - where эл, B<2, find sin(A-B). sin(A-B) = Question 4 If tan(A) = where A<21, and sin(B) = where -f- B<0, find cos(A-B). cos(A-B) = Submit